How to Fix INP Issues and Pass Core Web Vitals in 2026
Interaction to Next Paint replaced FID as a Core Web Vital. Here's how to diagnose and fix INP issues on any website.
INP (Interaction to Next Paint) measures how quickly your site responds to user interactions. It replaced FID as a Core Web Vital and is harder to pass. Many sites that passed FID fail INP because it measures every interaction, not just the first one.
The diagnostic process uses Chrome DevTools Performance panel, Web Vitals extension, and PageSpeed Insights to identify which interactions are slow and why. Common culprits include long JavaScript tasks, excessive DOM size, and layout thrashing during interactions.
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We cover the top 10 INP issues with specific fixes for each: breaking long tasks with yielding, reducing DOM complexity, optimizing event handlers, deferring non-critical JavaScript, and using CSS containment. Each fix includes before/after INP measurements.
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